include/linux/kallsyms.h

   1 /* Rewritten and vastly simplified by Rusty Russell for in-kernel
   2  * module loader:
   3  *   Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
   4  */
   5 #ifndef _LINUX_KALLSYMS_H
   6 #define _LINUX_KALLSYMS_H
   7
   8 #include <linux/errno.h>
   9 #include <linux/stddef.h>
  10
  11 #define KSYM_NAME_LEN 128
  12 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
  13                          2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
  14
  15 #ifdef CONFIG_KALLSYMS
  16 /* Lookup the address for a symbol. Returns 0 if not found. */
  17 unsigned long kallsyms_lookup_name(const char *name);
  18
  19 extern int kallsyms_lookup_size_offset(unsigned long addr,
  20                                   unsigned long *symbolsize,
  21                                   unsigned long *offset);
  22
  23 /* Lookup an address.  modname is set to NULL if it's in the kernel. */
  24 const char *kallsyms_lookup(unsigned long addr,
  25                             unsigned long *symbolsize,
  26                             unsigned long *offset,
  27                             char **modname, char *namebuf);
  28
  29 /* Look up a kernel symbol and return it in a text buffer. */
  30 extern int sprint_symbol(char *buffer, unsigned long address);
  31
  32 /* Look up a kernel symbol and print it to the kernel messages. */
  33 extern void __print_symbol(const char *fmt, unsigned long address);
  34
  35 int lookup_symbol_name(unsigned long addr, char *symname);
  36 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
  37
  38 #else /* !CONFIG_KALLSYMS */
  39
  40 static inline unsigned long kallsyms_lookup_name(const char *name)
  41 {
  42         return 0;
  43 }
  44
  45 static inline int kallsyms_lookup_size_offset(unsigned long addr,
  46                                               unsigned long *symbolsize,
  47                                               unsigned long *offset)
  48 {
  49         return 0;
  50 }
  51
  52 static inline const char *kallsyms_lookup(unsigned long addr,
  53                                           unsigned long *symbolsize,
  54                                           unsigned long *offset,
  55                                           char **modname, char *namebuf)
  56 {
  57         return NULL;
  58 }
  59
  60 static inline int sprint_symbol(char *buffer, unsigned long addr)
  61 {
  62         *buffer = '\0';
  63         return 0;
  64 }
  65
  66 static inline int lookup_symbol_name(unsigned long addr, char *symname)
  67 {
  68         return -ERANGE;
  69 }
  70
  71 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
  72 {
  73         return -ERANGE;
  74 }
  75
  76 /* Stupid that this does nothing, but I didn't create this mess. */
  77 #define __print_symbol(fmt, addr)
  78 #endif /*CONFIG_KALLSYMS*/
  79
  80 /* This macro allows us to keep printk typechecking */
  81 static void __check_printsym_format(const char *fmt, ...)
  82 __attribute__((format(printf,1,2)));
  83 static inline void __check_printsym_format(const char *fmt, ...)
  84 {
  85 }
  86 /* ia64 and ppc64 use function descriptors, which contain the real address */
  87 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  88 #define print_fn_descriptor_symbol(fmt, addr)           \
  89 do {                                            \
  90         unsigned long *__faddr = (unsigned long*) addr;         \
  91         print_symbol(fmt, __faddr[0]);          \
  92 } while (0)
  93 #else
  94 #define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
  95 #endif
  96
  97 static inline void print_symbol(const char *fmt, unsigned long addr)
  98 {
  99         __check_printsym_format(fmt, "");
 100         __print_symbol(fmt, (unsigned long)
 101                        __builtin_extract_return_addr((void *)addr));
 102 }
 103
 104 #ifndef CONFIG_64BIT
 105 #define print_ip_sym(ip)                \
 106 do {                                    \
 107         printk("[<%08lx>]", ip);        \
 108         print_symbol(" %s\n", ip);      \
 109 } while(0)
 110 #else
 111 #define print_ip_sym(ip)                \
 112 do {                                    \
 113         printk("[<%016lx>]", ip);       \
 114         print_symbol(" %s\n", ip);      \
 115 } while(0)
 116 #endif
 117
 118 #endif /*_LINUX_KALLSYMS_H*/